This era of massive migration Motion and settlement Statement was particularly encouraged Influence by President Thomas Jefferson following the Louisiana Purchase , giving rise to Cause_change_of_position_on_a_scale the expansionist philosophy known as `` manifest destiny '' .

The Gadsden Purchase of 1853 had opened Openness the territory to Americans , and the sudden growth Cause_change_of_position_on_a_scale of settlement and investment proved Coming_to_believe a source of great enmity Quarreling between local Apaches and the American newcomers .

The territorial era of Minnesota lasted from the Louisiana Purchase in 1803 to Minnesota 's achieving statehood in 1858 .